manifests: consistently use set -xeuo pipefail in postprocess scripts

The `set -euo pipefail` shouldn't be controversial.

The `set -x` bit is more debatable because it makes
the output more verbose but I find it helpful right
now as I comb through all sorts of details as part of
https://github.com/coreos/fedora-coreos-tracker/issues/1861.

If we care about less verbose output, I'd prefer we keep `-x` but
switched to having rpm-ostree buffer postprocess output and only dump it
if it fails.

standard/autoupdates.yaml

@@ -2,8 +2,7 @@
 postprocess:
   - |
     #!/usr/bin/env bash
-    set -euo pipefail
+    set -xeuo pipefail
     target=/usr/lib/systemd/system/default.target.wants
     mkdir -p $target
-    set -x
     ln -s ../bootc-fetch-apply-updates.timer $target

standard/generic-growfs.yaml

@@ -7,6 +7,6 @@ add-files:
 postprocess:
   - |
     #!/bin/bash
-    set -euo pipefail
+    set -xeuo pipefail
     mkdir -p /usr/lib/systemd/system/local-fs.target.wants
     ln -s ../bootc-generic-growpart.service /usr/lib/systemd/system/local-fs.target.wants/bootc-generic-growpart.service

standard/initramfs-full.yaml

@@ -2,6 +2,7 @@
 postprocess:
   - |
     #!/usr/bin/env bash
+    set -xeuo pipefail
     mkdir -p /usr/lib/dracut/dracut.conf.d
     cat > /usr/lib/dracut/dracut.conf.d/30-bootc-standard.conf << 'EOF'
     add_dracutmodules+=" lvm crypt fips "

standard/persistent-journal.yaml

@@ -5,7 +5,9 @@
 # rid of this once we move to sysusers and create the dir in the initrd.
 
 postprocess:
-  - | #!/bin/bash
+  - |
+    #!/bin/bash
+    set -xeuo pipefail
     mkdir -p /usr/lib/systemd/journald.conf.d/
     cat >/usr/lib/systemd/journald.conf.d/10-centos-bootc-persistent.conf << EOF
     [Journal]